def test_add_full_collection(self):
        fs = FieldSelector(["foo", "bar"])
        self.assertEqual(fs.selectors, ["foo", "bar"])

        fs.add_full_collection()
        self.assertEqual(fs.selectors, ["foo", "bar", None])
        self.assertEqual(str(fs), "<FieldSelector: .foo.bar[*]>")
    def test_add_full_collection(self):
        fs = FieldSelector(["foo", "bar"])
        self.assertEqual(fs.selectors, ["foo", "bar"])

        fs.add_full_collection()
        self.assertEqual(fs.selectors, ["foo", "bar", None])
        self.assertEqual(str(fs), "<FieldSelector: .foo.bar[*]>")